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I have a question about SRT intakes w/ ecu piggy. I heard from some people that S-AFC or Apexi should be used with the Srt intake. They state that you can actually loose horse power etc with out this. I didn't know what this was but I guess it actuall helps with the ecu etc. and cost about $700-$800 and should be installed by someone who knows thier stuff. They state that once the S-AFC / Apexi was installed it made a huge change.

If anyone knows more info on this please let me know. If it has to be used or if it is legal in California.

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Do you know if the Intake can, as those that I referenced, negatively effect the performance? I thought that it would only increase the performance. I am wondering why they referenced that it could decrease hp.

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I would NOT recommend using the SRT piggy back ECU and S-AFC, they do the same thing, which is correct your air/fuel ratio. The difference is that the SRT ECU is preprogramed for JUST the intake and nothing else. While the S-AFC is adjustable incase you ever decide to add anymore performance mods.

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I would NOT recommend using the SRT piggy back ECU and S-AFC, they do the same thing, which is correct your air/fuel ratio. The difference is that the SRT ECU is preprogramed for JUST the intake and nothing else. While the S-AFC is adjustable incase you ever decide to add anymore performance mods.

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I'm having the same problem deciding whether or not to wait for SRT to re-program my ECU for headers or just get an S-AFC. I've looked at the ECU wiring diagrams for the 2002 SRT race ECU and the Apexi S-AFC, and the wires from the S-AFC are connected to different wires of the car's computer than the SRT ECU is connected to. Does this mean that the commands from the S-AFC will over-ride that of the SRT to take into account headers, exhaust, etc, or must the SRT piggyback be removed and the wires re-soldered to fully utilize the S-AFC???

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FROM TOYOMOTO SITE
"Many said that it could not be done, due to the restrictive OBDII computer, however Toyomoto was the first to experiment with the fuel computer on the IS300. The end result of this experiment was an increases of 10-15 Rear Wheel Horsepower with the unit. "

Price: ....

is this only with the stock intake or an aftermarket i just thought of that.....

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im adding the toyomoto headers, but im still gonna remove the race ecu and replace it with a dyno tuned Apexi S-AFC. I just think its more precise (and will lead to better gains) and obviously adjustable for future mods.

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I've only had my intake for about a month. I have been e-mailing back and forth with SRT and they say I have to reflash my ECU when I get a header. They never told me anything about the new ECU being good with a header. Kind of a pain in the a$$ since I live in Guam. My car will be down for two+ weeks. Mail takes 7 days each way Can you shoot me a copy of that e-mail Gavron1??????

Hi so this is my first time on any forum discussion so bare with me! I love my IS so much that I’ve spent 4K in the past 9 months(bought it from a friend last year) to maintain it. Currently my first gen has almost 260k mikes on it. The cats rattling was about to drive me insane, it was running...

I bought my is with the muffler and 3rd cat already deleted with the stock headers still in place, I wanted more pops from the exhaust so i recently deleted my res and replaced from where the resonator was back with 2 1/2” pipe and a old used 3” tip.
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Hey everyone.
I’ve got a 03 is300 that I’ve been pondering at boosting/ swapping.
Obviously it’s got the stock 2jz Ge and I’m thinking of swapping in a 1jz I just can’t decide non vvti or vvti.
I’m trying to do it with the least amount of headaches as possible/ most cost effective.
Right now...